* {
  padding: 0;
  margin: 0;
}

html,
body {
  height: 100%;
  width: 100%;
}

.box {
  position: relative;
  margin: 0 auto;
  width: 300px;
  height: 300px;
}

.box > .smallBox,
.box > .bigBox {
  position: relative;
  width: 200px;
  height: 200px;
  border: 1px solid #000;
  min-width: 200px;
}

.box > .smallBox > .mask {
  position: absolute;
  left: 0;
  top: 0;
  width: 100px;
  height: 100px;
  background-color: rgba(0, 0, 0, 0.5);
}

.box > .smallBox > img {
  width: 100%;
}

.box > .bigBox {
  /* display: none; */
  position: absolute;
  top: 0;
  left: 200px;
  overflow: hidden;
}

.box > .bigBox > img {
  width: 200%;
}

.selectImg {
  display: flex;
  width: 200px;
  padding: 0;
  margin: 0;
}

/* .selectImg > img {
  width: 50px;
  box-sizing: border-box;
  border: 1px solid transparent;
} */

.selectImg > li {
  list-style: none;
}

.selectImg > li > img {
  width: 50px;
  box-sizing: border-box;
  border: 1px solid transparent;
  cursor: pointer;
}

.selectImg > li > .active {
  border: 1px solid #000;
}
